refactor(web): 前端目录重构 — consoles/pages → layouts/features + shared

- consoles/admin/ → layouts/admin-layout/
- consoles/workbench/ → layouts/workbench-layout/ + features/chat/
- pages/ → features/ (dashboard, models, projects, not-found)
- components/ → shared/components/
- hooks/ → shared/hooks/
- utils/ → shared/utils/
- 更新所有 import 路径 (src/web/ + tests/web/)
- 更新开发文档 (README.md, frontend.md, architecture.md)

src/web/routes.tsx

@@ -1,12 +1,12 @@
 import { Route, Routes } from "react-router";
 
-import { AdminConsoleLayout } from "./consoles/admin/AdminConsoleLayout";
-import { ChatPage } from "./consoles/workbench/pages/ChatPage";
-import { WorkbenchProjectGate } from "./consoles/workbench/WorkbenchProjectGate";
-import { NotFoundPage } from "./pages/404";
-import { DashboardPage } from "./pages/dashboard";
-import { ModelsPage } from "./pages/models";
-import { ProjectsPage } from "./pages/projects";
+import { ChatPage } from "./features/chat/ChatPage";
+import { DashboardPage } from "./features/dashboard";
+import { ModelsPage } from "./features/models";
+import { NotFoundPage } from "./features/not-found";
+import { ProjectsPage } from "./features/projects";
+import { AdminConsoleLayout } from "./layouts/admin-layout/AdminConsoleLayout";
+import { WorkbenchProjectGate } from "./layouts/workbench-layout/WorkbenchProjectGate";
 
 export function AppRoutes() {
   return (